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                    9.3  本章练习
            
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                                <h2 id="63--&#x6784;&#x9020;&#x65B9;&#x6CD5;">6.3  &#x6784;&#x9020;&#x65B9;&#x6CD5;</h2>
<p>&#x2003;&#x2003;&#x5728;&#x524D;&#x9762;&#x4ECB;&#x7ECD;&#x5C01;&#x88C5;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x4E00;&#x65E6;&#x7ED9;&#x5B66;&#x751F;&#x5BF9;&#x8C61;&#x7684;&#x6027;&#x522B;&#x8D4B;&#x503C;&#x4E4B;&#x540E;&#x5C31;&#x4E0D;&#x80FD;&#x4FEE;&#x6539;&#x7684;&#x8FD9;&#x4E2A;&#x9700;&#x6C42;&#x5176;&#x5B9E;&#x5E76;&#x6CA1;&#x6709;&#x5B9E;&#x73B0;&#xFF0C;&#x56E0;&#x4E3A;&#x901A;&#x8FC7;Student wangYun = new Student();&#x521B;&#x5EFA;&#x5BF9;&#x8C61;&#xFF0C;&#x7136;&#x540E;&#x901A;&#x8FC7;wangYun.setStuSex(1);&#x65B9;&#x6CD5;&#x7ED9;&#x5B66;&#x751F;&#x5BF9;&#x8C61;wangYun&#x7684;stuSex&#x5C5E;&#x6027;&#x8D4B;int&#x578B;&#x201C;1&#x201D;&#x8FD9;&#x4E2A;&#x503C;&#xFF0C;&#x4E4B;&#x540E;&#x4ECD;&#x7136;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;wangYun.setStuSex(2);&#x65B9;&#x6CD5;&#x5C06;wangYun&#x7684;stuSex&#x5C5E;&#x6027;&#x503C;&#x4ECE;&#x201C;1&#x201D;&#x6539;&#x4E3A;&#x201C;2&#x201D;&#xFF0C;&#x6240;&#x4EE5;&#x6CA1;&#x6709;&#x5B9E;&#x73B0;&#x4E00;&#x65E6;&#x8D4B;&#x503C;&#x4E4B;&#x540E;&#x5C31;&#x4E0D;&#x80FD;&#x4FEE;&#x6539;&#x7684;&#x9700;&#x6C42;&#x3002;</p>
<h3 id="631--&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x89E3;&#x51B3;&#x95EE;&#x9898;">6.3.1  &#x6784;&#x9020;&#x65B9;&#x6CD5;&#x89E3;&#x51B3;&#x95EE;&#x9898;</h3>
<p>&#x2003;&#x2003;&#x63A5;&#x4E0B;&#x6765;&#x901A;&#x8FC7;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x7684;&#x5F62;&#x5F0F;&#xFF0C;&#x5B9E;&#x73B0;&#x4E0A;&#x9762;&#x7684;&#x529F;&#x80FD;&#xFF0C;&#x5C06;Student&#x7C7B;&#x7684;&#x4EE3;&#x7801;&#x6539;&#x9020;&#x4E3A;&#x5982;&#x4E0B;&#x5F62;&#x5F0F;&#x3002;&#x4E3A;&#x4E86;&#x8282;&#x7701;&#x7BC7;&#x5E45;&#xFF0C;&#x7701;&#x7565;&#x4E86;Student&#x7C7B;&#x4E2D;&#x7684;&#x5176;&#x4ED6;&#x65B9;&#x6CD5;&#x3002;&#x4F46;&#x52A1;&#x5FC5;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;&#x4E3A;&#x4E86;&#x5B9E;&#x73B0;&#x4E00;&#x65E6;&#x7ED9;&#x5B66;&#x751F;&#x5BF9;&#x8C61;&#x7684;&#x6027;&#x522B;&#x8D4B;&#x503C;&#x4E4B;&#x540E;&#x5C31;&#x4E0D;&#x80FD;&#x4FEE;&#x6539;&#x7684;&#x529F;&#x80FD;&#xFF0C;&#x6240;&#x4EE5;&#x53BB;&#x6389;&#x4E86;setStuSex(int sex)&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x4FDD;&#x8BC1;&#x5176;&#x4ED6;&#x5BF9;&#x8C61;&#x4E0D;&#x80FD;&#x4FEE;&#x6539;&#x5B66;&#x751F;&#x5BF9;&#x8C61;&#x7684;&#x6027;&#x522B;&#x3002;</p>
<pre><code>public class Student 

{

    private String stuName;                

    private int stuAge;                    

    private int stuSex;                     

    private int stuGrade;                   

    //**&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x7528;&#x6237;&#x521D;&#x59CB;&#x5316;&#x5BF9;&#x8C61;&#x7684;&#x6210;&#x5458;&#x53D8;&#x91CF;**

    **public Student(String name,int age,int sex,int grade){**

    **this.stuName = name;**

    **this.stuAge = age;**

    **this.stuSex = sex;**        

    **this.stuGrade = grade;**

    **}**

    //&#x7701;&#x7565;&#x4E86;Student&#x7C7B;&#x4E2D;&#x7684;&#x5176;&#x4ED6;&#x65B9;&#x6CD5;

}
</code></pre><p>&#x6D4B;&#x8BD5;&#x7C7B;TestStudent5&#x7684;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code>public class TestStudent5

{

    public static void main(String[] args) 

    {

        //&#x4F7F;&#x7528;&#x5E26;&#x53C2;&#x7684;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x521B;&#x5EFA;wangYun&#x5B66;&#x751F;&#x7C7B;&#x5BF9;&#x8C61;&#x5E76;&#x521D;&#x59CB;&#x5316;&#x5BF9;&#x8C61;

        Student wangYun = new Student(&quot;&#x738B;&#x4E91;&quot;,22,1,4);     

        wangYun.learn();

        String rstString = wangYun.doHomework(22);

        System.out.println(rstString);

    }

}
</code></pre><p>&#x7F16;&#x8BD1;&#x8FD0;&#x884C;&#x7A0B;&#x5E8F;&#xFF0C;&#x5176;&#x7ED3;&#x679C;&#x5982;&#x56FE;6.7&#x6240;&#x793A;&#x3002;</p>
<center><img src="https://labfile.oss.aliyuncs.com/library/textbook-java1/img/d6z/tu6.7.png"></center>
<center>&#x56FE;6.7  &#x4F7F;&#x7528;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x521B;&#x5EFA;&#x5E76;&#x521D;&#x59CB;&#x5316;&#x5BF9;&#x8C61;</center>  

<h3 id="632--&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x7684;&#x4F7F;&#x7528;">6.3.2  &#x6784;&#x9020;&#x65B9;&#x6CD5;&#x7684;&#x4F7F;&#x7528;</h3>
<p>&#x2003;&#x2003;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF08;&#x4E5F;&#x79F0;&#x4E3A;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF09;&#x662F;&#x4E00;&#x79CD;&#x7279;&#x6B8A;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x5B83;&#x5177;&#x6709;&#x4EE5;&#x4E0B;&#x7279;&#x70B9;&#x3002;</p>
<ul>
<li><p>&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x7684;&#x65B9;&#x6CD5;&#x540D;&#x5FC5;&#x987B;&#x4E0E;&#x7C7B;&#x540D;&#x76F8;&#x540C;&#x3002;</p>
</li>
<li><p>&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x6CA1;&#x6709;&#x8FD4;&#x56DE;&#x7C7B;&#x578B;&#xFF0C;&#x4E5F;&#x4E0D;&#x80FD;&#x5B9A;&#x4E49;&#x4E3A;void&#xFF0C;&#x5728;&#x65B9;&#x6CD5;&#x540D;&#x524D;&#x4E0D;&#x58F0;&#x660E;&#x8FD4;&#x56DE;&#x7C7B;&#x578B;&#x3002;</p>
</li>
</ul>
<p>&#x2003;&#x2003;&#x5176;&#x5B9E;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x662F;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x7684;&#xFF0C;&#x8FD4;&#x56DE;&#x7684;&#x662F;&#x521A;&#x521A;&#x88AB;&#x521D;&#x59CB;&#x5316;&#x5B8C;&#x6210;&#x7684;&#x5F53;&#x524D;&#x5BF9;&#x8C61;&#x7684;&#x5F15;&#x7528;&#x3002;&#x65E2;&#x7136;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x8FD4;&#x56DE;&#x88AB;&#x521D;&#x59CB;&#x5316;&#x5BF9;&#x8C61;&#x7684;&#x5F15;&#x7528;&#xFF0C;&#x4E3A;&#x4EC0;&#x4E48;&#x4E0D;&#x5199;&#x8FD4;&#x56DE;&#x503C;&#x7C7B;&#x578B;&#x5462;&#xFF1F;&#x4F8B;&#x5982;Student&#x7C7B;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x4E3A;&#x4EC0;&#x4E48;&#x4E0D;&#x5199;&#x6210; public Student Student&#xFF08;&#x53C2;&#x6570;&#x5217;&#x8868;&#xFF09;&#xFF5B;&#x2026;&#xFF5D;&#x5462;&#xFF1F;</p>
<p>&#x2003;&#x2003;&#x56E0;&#x4E3A;Java&#x8BBE;&#x8BA1;&#x4EBA;&#x5458;&#x628A;&#x8FD9;&#x79CD;&#x65B9;&#x6CD5;&#x540D;&#xFF08;&#x7C7B;&#x540D;&#xFF09;&#x548C;&#x8FD4;&#x56DE;&#x7C7B;&#x578B;&#x7684;&#x7C7B;&#x540D;&#x76F8;&#x540C;&#x7684;&#x65B9;&#x6CD5;&#x770B;&#x6210;&#x4E00;&#x4E2A;&#x666E;&#x901A;&#x65B9;&#x6CD5;&#xFF0C;&#x53EA;&#x662F;&#x540D;&#x79F0;&#x201C;&#x78B0;&#x5DE7;&#x201D;&#x76F8;&#x540C;&#x7F62;&#x4E86;&#xFF0C;&#x7F16;&#x8BD1;&#x5668;&#x8BC6;&#x522B;&#x65F6;&#x4E5F;&#x4F1A;&#x8BA4;&#x4E3A;&#x5B83;&#x662F;&#x4E00;&#x4E2A;&#x65B9;&#x6CD5;&#x3002;&#x4E3A;&#x4E86;&#x548C;&#x666E;&#x901A;&#x65B9;&#x6CD5;&#x8FDB;&#x884C;&#x533A;&#x522B;&#xFF0C;Java&#x8BBE;&#x8BA1;&#x4EBA;&#x5458;&#x89C4;&#x5B9A;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x4E0D;&#x5199;&#x8FD4;&#x56DE;&#x503C;&#xFF0C;&#x7F16;&#x8BD1;&#x5668;&#x901A;&#x8FC7;&#x8FD9;&#x4E00;&#x89C4;&#x5B9A;&#x8BC6;&#x522B;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x8BF4;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x771F;&#x7684;&#x6CA1;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x3002;</p>
<p>&#x2003;&#x2003;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x7684;&#x4E3B;&#x8981;&#x4F5C;&#x7528;&#x662F;&#x5B8C;&#x6210;&#x5BF9;&#x8C61;&#x7684;&#x521D;&#x59CB;&#x5316;&#x5DE5;&#x4F5C;&#xFF0C;&#x5B83;&#x80FD;&#x591F;&#x628A;&#x5B9A;&#x4E49;&#x5BF9;&#x8C61;&#x65F6;&#x7684;&#x53C2;&#x6570;&#x4F20;&#x7ED9;&#x5BF9;&#x8C61;&#x3002;&#x4E00;&#x4E2A;&#x7C7B;&#x53EF;&#x4EE5;&#x5B9A;&#x4E49;&#x591A;&#x4E2A;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x6839;&#x636E;&#x53C2;&#x6570;&#x7684;&#x4E2A;&#x6570;&#x3001;&#x7C7B;&#x578B;&#x6216;&#x6392;&#x5217;&#x987A;&#x5E8F;&#x6765;&#x533A;&#x5206;&#x4E0D;&#x540C;&#x7684;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code>public class Student 

{

    private String stuName;       

    private int stuAge;            

    private int stuSex;           

    private int stuGrade;         

    //&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x7528;&#x6237;&#x521D;&#x59CB;&#x5316;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;

    public Student(String name,int age,int sex,int grade){

        this.stuName = name;

        this.stuAge = age;

        this.stuSex = sex;         

        this.stuGrade = grade;

    }

    //&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x7528;&#x6237;&#x521D;&#x59CB;&#x5316;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#xFF08;&#x4E0D;&#x5E26;&#x5E74;&#x7EA7;&#x53C2;&#x6570;&#xFF0C;&#x8BBE;&#x7F6E;&#x5E74;&#x7EA7;&#x9ED8;&#x8BA4;&#x503C;&#x4E3A;4&#xFF09;

    public Student(String name,int age,int sex){

        this.stuName = name;

        this.stuAge = age;

        this.stuSex = sex;

        this.stuGrade = 4;

    }       

    //&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x7528;&#x6237;&#x521D;&#x59CB;&#x5316;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;

    //&#x4E0D;&#x5E26;&#x5E74;&#x9F84;&#x3001;&#x5E74;&#x7EA7;&#x53C2;&#x6570;&#xFF0C;&#x8BBE;&#x7F6E;&#x5E74;&#x9F84;&#x9ED8;&#x8BA4;&#x503C;&#x4E3A;22&#xFF0C;&#x5E74;&#x7EA7;&#x9ED8;&#x8BA4;&#x503C;&#x4E3A;4

    public Student(String name,int sex){

        this.stuName = name;

        this.stuAge = 22;

        this.stuSex = sex;

        this.stuGrade = 4;

    }

    //&#x7701;&#x7565;&#x4E86;Student&#x7C7B;&#x4E2D;&#x7684;&#x5176;&#x4ED6;&#x65B9;&#x6CD5;

}
</code></pre><p>&#x2003;&#x2003;&#x65B0;&#x5EFA;&#x6D4B;&#x8BD5;&#x7C7B;TestStudent6&#xFF0C;&#x5176;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF0C;&#x8FD0;&#x884C;&#x7ED3;&#x679C;&#x5982;&#x56FE;6.8&#x6240;&#x793A;&#x3002;</p>
<pre><code>public class TestStudent6

{

    public static void main(String[] args) 

    {

        //&#x4F7F;&#x7528;&#x4E0D;&#x540C;&#x53C2;&#x6570;&#x5217;&#x8868;&#x7684;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x521B;&#x5EFA;wangYun&#x3001;liuJT&#x3001;nanTH&#x4E09;&#x4E2A;&#x5B66;&#x751F;&#x7C7B;&#x5BF9;&#x8C61;

        Student wangYun = new Student(&quot;&#x738B;&#x4E91;&quot;,22,1,4);     

        Student liuJT = new Student(&quot;&#x5218;&#x9759;&#x6D9B;&quot;,21,2);  

        Student nanTH = new Student(&quot;&#x5357;&#x5929;&#x534E;&quot;,1);



        wangYun.learn();

        String rstString = wangYun.doHomework(22);

        System.out.println(rstString);



        liuJT.learn();                          //&#x8C03;&#x7528;liuJT&#x5BF9;&#x8C61;&#x7684;learn()&#x65B9;&#x6CD5;

        //&#x8C03;&#x7528;liuJT&#x5BF9;&#x8C61;&#x7684;getStuName()&#x548C;getStuGrade()&#x65B9;&#x6CD5;&#x83B7;&#x5F97;&#x5C5E;&#x6027;&#x503C;

        System.out.println(liuJT.getStuName() + &quot; &#x6B63;&#x5728;&#x8BFB;&#x5927;&#x5B66;&quot; + liuJT.getStuGrade() + &quot;&#x5E74;&#x7EA7;&quot;);



        System.out.println(nanTH.doHomework(23));          //&#x8C03;&#x7528;nanTH&#x5BF9;&#x8C61;&#x7684;doHomework(23)&#x65B9;&#x6CD5;

    }

}
</code></pre><p><center><img src="https://labfile.oss.aliyuncs.com/library/textbook-java1/img/d6z/tu6.8.png"></center></p>
<p><center>&#x56FE;6.8  &#x4F7F;&#x7528;&#x7C7B;&#x7684;&#x591A;&#x4E2A;&#x6784;&#x9020;&#x65B9;&#x6CD5;</center><br>&#x2003;&#x2003;&#x5982;&#x679C;&#x5728;&#x5B9A;&#x4E49;&#x7C7B;&#x65F6;&#x6CA1;&#x6709;&#x5B9A;&#x4E49;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x5219;&#x7F16;&#x8BD1;&#x7CFB;&#x7EDF;&#x4F1A;&#x81EA;&#x52A8;&#x63D2;&#x5165;&#x4E00;&#x4E2A;&#x65E0;&#x53C2;&#x6570;&#x7684;&#x9ED8;&#x8BA4;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x8FD9;&#x4E2A;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x4E0D;&#x6267;&#x884C;&#x4EFB;&#x4F55;&#x4EE3;&#x7801;&#x3002;&#x5982;&#x679C;&#x5728;&#x5B9A;&#x4E49;&#x7C7B;&#x65F6;&#x5B9A;&#x4E49;&#x4E86;&#x6709;&#x53C2;&#x7684;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x6CA1;&#x6709;&#x663E;&#x5F0F;&#x5730;&#x5B9A;&#x4E49;&#x65E0;&#x53C2;&#x7684;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#xFF0C;&#x90A3;&#x4E48;&#x5728;&#x4F7F;&#x7528;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x521B;&#x5EFA;&#x7C7B;&#x5BF9;&#x8C61;&#x65F6;&#xFF0C;&#x5219;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x9ED8;&#x8BA4;&#x7684;&#x65E0;&#x53C2;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x3002;</p>
<p>&#x2003;&#x2003;&#x4F8B;&#x5982;&#xFF0C;&#x5728;TestStudent6&#x7A0B;&#x5E8F;&#x7684;main&#x65B9;&#x6CD5;&#x5185;&#x6DFB;&#x52A0;&#x4E00;&#x884C;&#x8BED;&#x53E5;&#xFF1A;Student leiJing = new Student();&#xFF0C;&#x7F16;&#x8BD1;&#x5668;&#x4F1A;&#x62A5;&#x9519;&#xFF0C;&#x63D0;&#x793A;&#x6CA1;&#x6709;&#x627E;&#x5230;&#x65E0;&#x53C2;&#x7684;&#x6784;&#x9020;&#x65B9;&#x6CD5;&#x3002;</p>

                                
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